Valve



Patentes July 4, i933 l vthroughout the entire length of their concavek UNITED STATES PATENT OFFICE ALEXANDER V. SAHVAROFF, OF CINCINNATI, OHIO',ASSIGNOR TO WORTHINGTON PUMP AND MACHINERY CORPORATION, OF NEW YORK, N. Y., A. CORPORATION OF 'VIR- -GllllllY VALVE Application iled February 12, 1930. Serial No. 427,667.

air compressors, and the like, and especially to automatic plate valves of the class that function by bending and are free from localized bending with its resulting erystalliza tion of the metal and early fracture.

More specifically the invention relates to automatic plate valves of that class described in United States Patent Reissue 13,991 and Patent Number 1,341,145 and an object of the present invention is to provide an improved valve-of this class in which pinching of the valve strips bet-Ween the seat and guard at the ends of the strip will be prevented.

In the constructionl of valves of the 'type as disclosed in the above mentioned patents and corresponding types of valves it has heretofore been the practice to mill the concave surfaces of the guard on two radii instead of on a single radius, because the milling of the guards on a single radius would lcause very sharp angles at the termination of the concave surfaces of the guards and invariably result in the pinching of the ends of the strips causing a strain on the'ends of the strip resulting in breakage of strips, digging in7 of the ends of the strip in the guard and other disadvantages which impair the longevity and eiliciency of the valve. The milling of the ends 'of the concave portions on short radii so as to make the angle between the seat and guard as blunt as possible to preventy pinching necessarily left the strip unsupported for an aplpreciable part of the guard resulting in numerous definite objections.

. '.lhel present invention comprehends 'the provision of a valve structure which embodies all of theadvantages, not only in valve operation but in manufacture of the valves, of' milling the guards on a single radius y Surfaces and eliminates the undesirable and definite objections to such a construction by providing v'abrupt orv transverse shoulders near-the ends of the millings of the guard to form stops for the valve strips and, in providing the ends of the guard `With'a square shoulder to a depth equal Ato the thickness of the strip, plus suitable tolerance, eliminates l,the pinching of the ends of the strigls all possibility strips.

With these and other objects in view which will appear from the following speciiication, the invention consists in various features of construction and `combination of parts, which will be iirst described in .connection with the accompanying drawing, showing a valve of the preferred form embodying the invention of pinching of the ends of the and the features forming the invention will be specifically pointed out in the` claim.. v

In the. drawing Figure is a cross-section through a valve construe d in accordance with this invention and taken on the line l. of Figure 2.

Figure 2 is a plan view of the guard section of the valve taken on the line 2 2 of Figure 1.

Figure 43 is a. cross-section through thel valve taken on line of Figure 2.

. Referring more particularly to the drawing, the improved valve comprises the valve seat 1 and guard member 2. 'llhe valve seat l and guard 2 are provided with parallel spaces or passageways 3 and 4 respectively which are disposed in staggered relations as clearly shown in Figure 3 of the drawing The guard or abutment 2 has concave recesses 5 milled in the ribs 6 which' are spaced s@ between the openings 3, which milled surfaces 5 serve as abutment surfaces for the valve strips 7. The valvejstrips 7 are thin flexiblelplates and normally rest against the flat abutment surfaces 8 of the valve seat member 1.

rl`he milled surfaces 5 are milled upon the single uniform radius so that the valve strips 7 when in vopen position are subjected to the stresses of a uniformly loaded lever and the strip has a perfect backing against the guard throughout its entire length without unnatural stress or fatigue at any point. Also the milling ofthe surfaces 5 on a single uniform radius materially reduces the cost of manufacture of the valves. To prevent 7 by the sharp angles which are formed by t e millin of the surfaces 5 on'a uniform radius and ,consequently prevent end breakage of the strips as Well as the' strips digging in the guard, strips 10 which may be of any suitable material, preferably of steel are inserted in the guard or abutment member 2 and extend transversely across the ends of the milled surfaces 5 the proper distances in-l is entirel eliminated, also by the insertion of the shou der forming strips 10 it is possible to control .exactly the active length of the guard milling which will permit the valve strips 7 to be made of exact sizes in large quantities and will consequently eliminate the itting by hand of the strlps to determine the proper length of the strips, since in aproved methods of construction previously 1n use it was almost impossible to control exactly the length of the guard milling.

It will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown but that this ma be modified vvidely within the invention v de ned by the claim.

What is claimed is: The combination with a valve seat having aplurality of ports, a plurality of thin, elastic, valve-forming strips free to permit uni- `form bending, an abutment block having abutment surfaces, and other shoulder-formso y 'surfaces inwardly of the ends 0f the curved ing strips inserted in said abutment block.

and extending across the ends of the shorter curved abutment-surfaces, said 'shoulderforming strips providing square transverse ends for the active portions of said curved abutment surfaces.

In testimony whereof I 'affixmy signature.

ALEXANDER V. SAHAROFF.

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